Oxidation of α,β-enones and alkenes with oxone and sodium halides: A convenient laboratory preparation of chlorine and bromine
作者:R.Karl Dieter、Lois E. Nice、Sadanandan E. Velu
DOI:10.1016/0040-4039(96)00295-x
日期:1996.4
Mixtures of oxone and sodium chloride or sodium bromide afford solutions of chlorine or bromine, respectively. These solutions effectively add chlorine and bromine to α,β-enones and alkenes. The method affords improved yields of 3-alkyl-2-halo-2-cycloalkenones which are sometimes difficult to prepare.
Structure–function relationship exploration for enhanced thermal stability and electro-optic activity in monolithic organic NLO chromophores
作者:Wenwei Jin、Peter V. Johnston、Delwin L. Elder、Karl T. Manner、Kerry E. Garrett、Werner Kaminsky、Ruimin Xu、Bruce H. Robinson、Larry R. Dalton
DOI:10.1039/c6tc00358c
日期:——
dopants in guest–host systems to study intrinsic structure–function relationships in organic electro-optic (EO) materials. In a library of EO molecules with varied bridge segments, molecular modification of the donor with bis(tert-butyldiphenylsilyl) groups led to improvement in formation of amorphous films and led to enhanced poling efficiency. Further modification to include a carbazole site-isolation group
我们已经开发了一系列新颖的整体材料,该材料基于以前在来宾-宿主系统中被视为掺杂剂的分子,以研究有机电光(EO)材料的内在结构与功能之间的关系。在具有变化的桥链段的EO分子库中,用双(叔丁基二苯基甲硅烷基)基团对供体的分子修饰导致非晶膜形成的改善并提高了极化效率。进一步修改以在桥上包括咔唑位点隔离基团,从而有效降低了分子间偶极-偶极相互作用,从而产生了极化效率约为3(nm V -1)2的材料,并将玻璃化转变温度提高到比报道的类似整体材料高20–40°C。该热稳定性水平可与普通的客体/主体系统相媲美,后者将聚甲基丙烯酸甲酯(PMMA)用作主体。我们的研究表明,π桥的长度和类型会影响发色团的第一个分子超极化率β,这在EO响应中得到了反映。这些发现进一步促进了整体材料因其增加的EO行为和改善的热稳定性而变得有用,从而使该材料系统成为商业应用中宾主系统的竞争者。
Alkoxy-substituted phenyltetraene nonlinear optically active compounds, films and devices that include the compounds, and methods for making and using the compounds, films, and devices.
Novel isophorone derivatives are disclosed and possess utility as insect sterilants, plant growth regulators and fungicides.
本发明揭示了新的异佛尔酮衍生物,具有作为昆虫灭绝剂、植物生长调节剂和杀菌剂的效用。
Aromatic compositions
申请人:Firmenich SA
公开号:US03937228A1
公开(公告)日:1976-02-10
A process for improving, enhancing or modifying the organoleptic properties of a tobacco product, which comprises adding thereto about 1 to about 1000 parts per million based on the weight of tobacco of at least one compound selected from the group consisting essentially of: A. epoxy-.beta.-ionone B. 6-methyl-hepta-3,5-dien-2-one C. 3-isopropyl-cyclopent-2-en-1-one D. octa-3,5-dien-2-one E. nonane-2,5,8-trione F. 2-methyl-5-(.alpha.-methyl-.alpha.-hydroxyethyl)-cyclohex-2-en-1-one G. 4-methylthiobutan-2-one.
一种改善、增强或修改烟草产品感官特性的工艺,包括向烟草中添加以下至少一种化合物,其添加量为每百万份之一至每百万份之一千,基于烟草重量计算:A. 环氧-β-紫罗兰酮 B. 6-甲基庚-3,5-二烯-2-酮 C. 3-异丙基环戊-2-烯-1-酮 D. 辛-3,5-二烯-2-酮 E. 辛烷-2,5,8-三酮 F. 2-甲基-5-(α-甲基-α-羟乙基)-环己-2-烯-1-酮 G. 4-甲基硫基丁-2-酮。